Apparatus for treating paper stock



F. P. MILLER.

APPARATUS FOR TREATING PAPER STOCK.

APPLICATION FILED FEB. 17, I920.

Patented Oct. 24, 1922.

2 SHEETSSHEET I.

F. P. MILLER.

APPARATUS FOR TREATING PAPER STOCK.

APPLICATION FILEDIEBI I7. I920.

Patented Oct. 24, 1922.

2 SHEETS SHE[T Z FRANK P. MILLEEQ, GE DOWHING'KWR H,EElillt'fiilfLiiAhlIA-L.

ESE TREATIHQ? $531512.

Applicatien filed February 17, 1926*. Serial No.

To all'wiwm t may concern:

Be It known, that l, FRANK P. MILLER,

a citizen of the United States, residing in.

Downingtown. Chester County, Pennsylyania, have invented certainImprovements in an Apparatus for Treating Paper Stock,

of which the following is a specification.

My invention relates to certain improvements in apparatus for carryingout a process for reducing paper stock for which application for patentwas filed by me of even date herewith, under Seriai No. 859,221.

One object or the invention is to provide an apparatus which willseparate finely divided particles of paper stock and fibre from thecoarse stock before the coarse stock issubjected to the reducing actionof a beating engine. I

A further object of the invention is to separate any foreign matter fromthepaper stock and to provide a moving platform upon which the coarseparticles of material will pass so as to allow an operator to removestrings and other particles which are not desired in the manufacture ofpaper board. My invention also relates to certain details which will bedescribed hereafter.

In the accompanying drawings:

Figure 1 is a plan view, illustrating in diagram my improved apparatusfor treatingi paper stock;

ig. 2 is a sectional view on the line 2-2, Fi 1, drawn to an enlargedscale, and

ig. 3 is a sectional view on the line 3-3, Fig. 1.

Referring to the drawings, 1, 1, are rotary digestors of the ordinarytype into which the paper stock is placed with hot water, and thematerial remains in the digestors until the sizing has been dissolvedand the majority of the fibres of the paper liberated so as to form abody of pulp. The paper and pulp are then discharged from one of thedigestors onto a floor 2 to form a pile m. At the end of the floor is agutter 3. Water under pressure from a nozzle 4 is played upon the pileso as to loosen the particles and further reduce the stock and open thefibres and thin the pulp. This nozzle is preferably attached to a hoseheld by an operator so that the water can be played on any portion ofthe pile and the nozzle can be moved along the floor to attack piles ofpulp discharged from any one of the series of digestors.

As the pulp is discharged from the pile it flows, with the water, into agutter 3 a point where it flows throu h a gutter into a trough 5 andthrough a screen ,The screen consists, in the present instance,

of a series of bars spaced a given distance apart so as to separate thecoarse stock from the fi ne stock. The particles of paper and othermaterial that do not pass through the screen are carried up the screenby endless conveyer 7 having flights 8 of any suitable form which willengage the pap r and carry it to the upper end of the screen,discharging it onto a horizontal conveyer forming a sorting table.

It will be noticed that the short con necting gutter 3 is shaped so thatits bottom is some distance from the flights. This construction allowsany large particles of material to pass freely to the screen. In theevent of this material being engaged by the flights the chain will yieldbetween the two sprocket wheels 10, 10 The conveyer 9 passes around twosprocket wheels 11, 11*, and consists of a series of slats 12 attachedto chains at each side of the conveyer. The slats allow. the water topass freely from the stock discharge onto the conveyer, carrying with itany small particles of pulp and fibre that have been discharged onto theconveyer 9. At this point an operator removes any strings or sticks, orcoarse material which is not desirable. The remaining coarse stock isthen discharged over the end of the conveyer 9 and into the trough 5where it mixes with the previously screened stock.

In order to agitate the stock in the trough 5,1 locate in the bottom ofthe trough one or .more nozzles 13 fordirecting'jets of water underpressure into the stock and water.

This agitation also tends to separate any heavy foreign particles fromthe stock. These heavy particles, such as metal, will collectin a pocket14 from wh1ch they can be removed at intervals. Ribs 15 may be formed inthe bottom of the trough, as-

carries the material to the feed end of a screen 21. This screen isshown in diagram, as it may be any one of the standard screens used inscreening paper stock. The pulp that passes through the screen iscarried to a thickener 22 of the ordinary type, from which it isconveyed by any suitable means to the stuff chest of a paper makingmachine. This paper making machine, in the present instance, is amachine for making what is known as paper board. The raw stock is theordinary used papers consisting of newspapers, wrapping paper and boxpapers, although it will be understood that my process may be carriedout in connection with any suitable stock that requires a reduction suchas could be accomplished in the apparatus hereinbefore described.

In the present instance, the material flows onto the screen 21, and theusual flight conveyer 23 conveys the coarse material over the screen andto the lower end of an inclined trough 24. A flight conveyer 25 travelsover this trough and lifts the material. discharging it through a chuteto a beating engine 26 of any ordinary type, where it is reduced. Thestock is circulated in the beating engine until it is reduced to thedesired extent. When the material is discharged from the beating enginethrough a pipe 27 to the trough 5, it is mixed with the first-mentionedstock and flows with this stock to the screen 21 and is re-screened. Bythis means, a thorough mixture of the pulp that did not requirereduction by the beating engine is obtained with the stock that had beenreduced by the beating engine. In some instances, the reduced stock fromthe beating engine may be re-screened and the stock that has beensufiiciently reduced may pass directly to the stuff chest of a papermaking machine independently of the material that has been screened inthe first instance.

It will be seen by the above construction that I am enabled to remove alarge percentage of finely divided fibres and pulp from the paper stockthat has been treated in a digestor, or equivalent apparatus, and Whichhas been subjected to the jet of water under pressure and which can beused in the manufacture of paper, and like material, without passingthrough a beating engine, as I find that where this fine stock isfurther reduced by passing through a beating engine, it losesconsiderable of its strength, and the capacity of the mill is reduced asit occupies a certain percentage of room in the beating engine which canbe used to a greater advantage in the reduction of coarse stock.

I claim:

1. The combination in an apparatus for treating paper stock, of adigestor; a floor on which the material is discharged from the digestor;means for projecting a stream of water onto the material while on thefloor; a screen over which the material flows to separatethe fineparticles from the coarse particles of the stock; and a trough intowhich the separated fine particles flow.

2. The combination in apparatus for treating paper stock, of a.digestor; a floor onto which the material from the digestor isdischarged; means for projecting a stream of water onto the stock on thefloor; a screen for separating the fine particles of stock from thecoarse particles; a trough for receiving the fine particles; means forconveyin the coarse stock; a sorting table for receiving the stock fromthe conveyer, said table being so located that the stock, after theforei matter has been removed therefrom, wil pass into the trough.

3. The combination in apparatus for treatin paper stock, of a digestor;a floor onto w ich the stock is discharged from the digestor; means forprojecting a jet of water under pressure onto the paper stock so as tocontinue the reduction of the stock and to separate the fine particlesfrom the coarse particles; and a screen for screening the fine particlesfrom the coarse particles.

4. The combination in apparatus for treating paper stock, of a digestor;a floor for receiving the stock from the digestor; means for dilutingthe stock with water so that it will flow; a trough forreceiving thestock; a screen at the trough for separating the fine stock from thecoarse stock; means for conveying the coarse stock over the screen; anendless slat conveyer in the form of a table onto which the coarse stockis deposited from the conveying means so as to allow the foreign matterto be removed from the coarse stock before it flows back into thetrough; a screen for finally separating the fine stock from the coarsestock; and means for directing the fine stock to the stuff chest of apaper making machine and the coarse stock to a beating engine.

5. The combination in apparatus for treating paper stock, of a floor onwhich the material is discharged after being previously reduced to pulmeans for projecting water onto the pile of material on the floor so asto open up the pulp and allow the material to flow; a screen forprimarily separating the fine stock from the coarse stock; a trough intowhich the fine particles flow after passing through the screen; ahorizontal conveyer onto which the coarse stock is discharged, theconveyer having openings to allow the water and fine stock to flowdirectly into the trough, the conveyer discharging the coarse stociaintothe trough after it has been examined and undesirable particles removedtherefrom.

8. The combination in. apparatus for "treating paper stock, of a floorfor receiving the paper that has sen partially reduced to 1 1 projectinga. jet

of water onto the material while on the floor; a gutter at the edge ofthe floor into which the material flows with the Water; a screen at agiven point for separating the fine particles of material from thecoarse particles; and a sorting table arranged to receive the coarseparticles, said table discharging the material into the trough after theforeign matter has been removed therefrom.

7. The combination in apparatus for treating paper stock, of a digestor;a floor for receiving the stock from the digestor; means for supplyingWater to the stock; a screen for screening the fine stock from thecoarse stock; a trough under the screen for receiving the fine stock; asorting table for receiving the coarse stock so arranged that the tablewill discharge the stock into the trough; a Weir at the discharge end ofthe trough; a

Wheel having blades located at the front of.

the Weir to elevate the stock and discharge it over the Weir; a troughfor receiving the stock; a screen with which the trough communicates forfinally separating the fine particles from the coarse particles; abeating engine; means for carrying the coarse stock from the screen tothe beating engine; and means for returning the reduced stock from thebeating engine to a point in front of the last-mentioned screen.

8. The combination in an apparatus for treating paper stock, of atrough; a screen; means for directing paper stock and Water to thescreen, the fine stock and water passing through the screen and into thetrough; and a nozzle in the lower portion of the trough through whichwater under pressure is projected into the trough to keep the FRANK P.MILLER.

